Originally Posted by
farscott
I have several of the Volquartsen kits and complete Volquartsen guns. The benefit of the kits is a better trigger with reduced weight, a smoother feeling, and reduced overtravel. The magazine safety can also be defeated with the kit, which is something that you may or may not wish to do.
I would not replace the firing pin and extractor unless you are experiencing failures to fire or failures to extract. The Mark IV firing pin does have a design flaw that leads to premature breakage, but the part fails safely and without damage to the rest of the pistol.